Perhaps you should try some spelling variations:
rohr » lohr (Expand Search)
mohr » mehr (Expand Search), lohr (Expand Search), mohn (Expand Search)
john » sohn (Expand Search), joh (Expand Search), hohn (Expand Search), johne (Expand Search), jsohn (Expand Search), jhohn (Expand Search)
johne » sohne (Expand Search), johe (Expand Search), hohne (Expand Search), johnee (Expand Search), jsohne (Expand Search), jhohne (Expand Search), ohne (Expand Search), joane (Expand Search)
ohn » ohne (Expand Search), sohn (Expand Search), hohn (Expand Search)
hbsohn » hbsohne (Expand Search), hbssohn (Expand Search), hbshohn (Expand Search)
sbohne » sbohnee (Expand Search), sbsohne (Expand Search), sbhohne (Expand Search), sohne (Expand Search)
university » universitat (Expand Search)

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "((rohr OR ruhr) OR ((mohr OR ((john OR ohn) OR johne)) OR (hbsohn OR sbohne))) university bochum~".
• Adding a wildcard symbol may retrieve word variants: ((rohr OR ruhr) OR ((mohr OR ((john OR ohn) OR johne)) OR (hbsohn OR sbohne))) university bochum*.